Across
- 2. A large body of saltwater that covers most of the Earth
- 4. The process by which plants make their own food
- 6. The organ in the human body that pumps blood
- 8. The capital of France
- 10. The natural satellite of the Earth
- 13. The molten rock expelled by a volcano during an eruption
- 14. A shape with four equal sides and four right angles
- 15. The largest planet in our solar system
Down
- 1. The force that attracts objects toward one another
- 3. A liquid necessary for all known forms of life
- 5. The star at the center of our solar system
- 7. A polygon with three sides and three angles
- 9. The smallest unit of a chemical element
- 11. A mammal known for its ability to echolocate
- 12. The branch of science that deals with celestial objects